Expandable shelf



FIG. 1 is a perspective view of the expandable shelf in a retracted configuration;

FIG. 2 is a perspective view of the expandable shelf in an expanded configuration;

FIG. 3 is a front elevational view of the expandable shelf in the retracted configuration;

FIG. 4 is a rear elevational view of the expandable shelf in the retracted configuration;

FIG. 5 is a left side elevational view of the expandable shelf in both the retracted and the expanded configurations, the opposite side of which is an identical mirror image;

FIG. 6 is a top plan view of the expandable shelf in the retracted configuration; and,

FIG. 7 is a bottom plan view of the expandable shelf in the retracted configuration.

The features shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for an expandable shelf, as shown and described. 